Quite a common occurrence for motorists is the appearance of a knock on the engine when charging on the "cold". And no matter what the temperature outside.

Causes of knocks are quite diverse. If a knock appears on a warm car, and after bringing the engine to normal operating temperature, the knock disappears, then you can consider the five main causes of this malfunction.

Causes of knocking

• Of course, the main indicators may be increased thermal gaps, as on most engines with high mileage, the correct setting of the valves disappears. It is necessary to adjust to the position of the valve.
• Another reason may be the wear of the hydraulic compensators. When replacing hydraulic compensators, it is necessary to replace the engine oil and the oil filter.
• there will be no exception for the wear of indigenous liners, the gap between which has increased. During the "cold" work, a knock will be heard, and with the moment the engine oil warms up, pressure increases and the knock disappears. If the pressure sensor constantly “jumps”, then the problem is clearly with the oil pump.
• the timing mechanism can also give knocks, gaps in the beds are increased, and when heated, the metal expands and everything subsides.
• and of course the most unpleasant reason is the knock caused by the wear of the piston (at first they are just loose, then they start knocking the skirt, which in most cases leads to a skirt break), or severe wear of the compression rings.

If you began to notice such knocks on the cold, do not neglect it. At the most crucial moment the car can fail. And the repair will cost much more expensive than in the early stages of knocking.

See also: Replacing the diesel particulate filter